Sorry I cannot be of more help. I',m pretty darn new too and what I'm reading is that holding tabs are something of a 'trial and error' but should be a button click option suggestion.
I did find this.
Since this is more like 2.5D and similar to what I do with my Plasma CNC cutter I can tell you that SheetCAM will do what you are expecting with holding tabs, lead in/lead out etc. It also does nesting and many other things. I know your investment here is with this toolset. Just noting something very popular w/ us flameheads in the 2.5D space. It'll output the Gcode you need.